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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd64d90d887ac3793f15aeb8e1bf076cce2f4fd979fb53be28cccb6a644b34def' 
  AND token = 'E16woJbmxOmmvnM+r8Iqc5HboXTkA/vHd8hkw8IrvvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}