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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00a93a066353f30143817c4f37cc02cb157eaa0c9245dc944d8fcce9e0962221' 
  AND token = 'IQaThhvje3TFmou9AgDdzFhyVq7PVX+dlVbAyZ1Tr0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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