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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6514121e85acced207e80d9662496e58374ce1ebbad6d1d9d4bd3f6523b6bbf' 
  AND token = 'EMpeHd6PGtvyROpaZLEBiMFlaK8ivL9E6hoF1ihvNaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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