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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '297d4c0b950753bf7fa35cfc813236f728be16b04b21efad3fb84f2c8971c455' 
  AND token = 'wHZoUQuOKbD4OweKbCj4WDK4j6Ji4hZII4RAbwgsH84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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