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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '297c933a233eff44b3ffa46bd5943a2c350a245301c9323b648eb73ce6e38e8c' 
  AND token = 'qiX09XSCAPwCcvU7BbmyWKU15IWzOk6Cinumg82c0jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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