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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae00d8b0bd7719ef14cebdf40b83c8e4516cb8981b20cda8f6793725e354236e' 
  AND token = 'JOJ+M5qFQTX3Sxcjd4RaEQFYvVLat54893OO45KuQIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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