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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1afab54ba3bd43cacd9c6e311aed771736cf1f804c96a309f96d063f44371892' 
  AND token = '53McHHVdb5pdUWPwmoVcGBY2yg91katoOl9pG1Sv66o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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