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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f08eb91aaca3c4f97ac118c5cbd2c216f8f2c794cc088f038f16d9ed4c05e00' 
  AND token = '0BdVgF3+r11lhNmUtCh2FmXZAR1LKZeLayxMJ4+4Sec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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