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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6d88f78e54473ac535981b9ca07a11842beaa6adb6d6924d90dfc0abeb8b8b7' 
  AND token = 'QCmXJ9ISf9vqYw4v0xq9rRkNe+8zpazZUpbYFh5sctw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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