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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94e8484b640865d2aab4edc931d9b18f269bde2c490b70f3eff12e559cb0f219' 
  AND token = '/940Js0u5VbltXGO9PiQNXKpKH6xQ9Tl9i+Ht16zCwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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