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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a19ab207c79b33374b6da2f1dca054e9276b0a8cdfd4b99dbe77ff88037cac4' 
  AND token = 'BJ3tzWxeY6SA0+QdaV42JoA7OxBA97ymoOA9jalfUEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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