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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bffe9caabc8af0e570a6c534f7cd711a1943b94fc2c78775efcb98e1e8eb863' 
  AND token = 'fHUwAKz5bTraLk15odfFH7aFQGHi4pM+EAH3wlo90os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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