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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac383788d071ab4dfe49534e99c9633b9474e74dadaba8494b2c32291d61bfc7' 
  AND token = 'WXi0WDpSlQigrYAXrdDXTUKEQ7uXRVctzIbX/KVIkT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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