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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccaa35f8a2ee58ed92847da1fa29eab606d8a387a41050da9789aa1f616985f1' 
  AND token = '9LMYVj5pOu80fEO/9Qwh3EhWYVFWw6IUZ0OWPImIeIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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