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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f25acb4d6df724d378c39eb2fb7e7ee4e864aad388fe212973fa3303a961330' 
  AND token = 'flsbplTd1IrrOecKJMvLI72nR1TWtl3CH+BjOxp4oDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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