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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28db7517b53fa0ec84b9b56be1dd78bad4cf40106c3b0b66cbcc9a38fa8b4137' 
  AND token = 'x65k9NirkVr/WyFxAPdZrwXJR2rP7niJZveFEUV0FFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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