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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b134a13bcb1b39d1bfd11ac2d1f497131587db0c0afb57148130ba4f33737af' 
  AND token = 'UPmByk0sm9YdaigdsIXHMzMy/6v1J/mrAnkGj98R8rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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