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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fbfd9be33f514a980d2b58c812e5210b35916d39097d91a24b3ffceeeba4ca1' 
  AND token = 'LTcQaO4U3tF7Q8mLwBHkX1pJNKJ8x7oY8hY40uQa2EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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