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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '807bcc0af67843107db0403ba0d668bf20c5251fe1a14150ad8472b5273c2116' 
  AND token = 'T7t5unbvpSQw3GPSROKFjUfbO/cgywDSjX9WGXWrqyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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