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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26b6c3598b19a5ac2193eea9e95ba5125536ee988f523c240e8f7f5f5fadcf37' 
  AND token = '4jNWV97H7d8al7AHGQl+sLcrWPr70J4NxqLOCf8KvAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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