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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4664595db4ad6eca586ff7c0305e834a32b0c5bb7d3bc3ba2cd41146ba25450' 
  AND token = 'o3UFTGqeK4cKcMig6IdPnoMxjZlToy55Q1YBq9YB5N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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