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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b31b3767a5b1ac7ef958307f3ae4bbb6f8e17188469aae99461b649bbace7ec8' 
  AND token = 'LaZca6B51VQcdmOzUFtZRpnasV3GFumYymBed1XFGyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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