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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f104772c127050c777a562ca062e081459eea6bb89ca24ac5f38cd3555fa9144' 
  AND token = 't6IOUjnlaoZfSq47od3qXmR7vhywWji/y1MSbnNAN4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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