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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dadb12846577f6359db189a8d20d7416f720a248d359fa607a59f8516e979e49' 
  AND token = 'ZzAZ3m5/tl9TcTY7E3KcZNKG6MoL6bZex4RaMx3x7p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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