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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a88e6b3eed71d5f4b1950ce97f8f1587c27362d3a71270004bfee1962ab02856' 
  AND token = 'NguZ1Vyh6ejUxoSRgTwz/4lxxcH6vDjT3p6/Y3IS1cA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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