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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acba52ad3b0cfa0d2b233ba3b569f249f4cf60a3194193d696bb51b61e6584a9' 
  AND token = 'IBUtVTRvj7KiDsCX4XH+R9Bh3xytjM+5WZdNfE+MAPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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