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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9523ecdcda083447c6973e18732014889ccc22ee4911071c5a4ea13d08c3db50' 
  AND token = 'SNpaIc6eOsX68NaIMDKt/Bwq3nPDfqpwx6FPcJIS2kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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