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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '784cd82b1e89ae0e7ce585ed9f5cb9711955c92bdc63d6879bfab1f9ef98dff1' 
  AND token = 'eZzUczKEkDCenoP+Zm9Wt6ojtT1EGivL+t+JPqmF0Vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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