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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cee4787403b261961f9fa193ffa75ce860ff8d585bb340cf61060fabcac1b0cd' 
  AND token = '+QCpHi480+DWrU+PPY6m3w7XRMV0q5h8JhCbOhXUYqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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