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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d3663de232fa69c897702b86f0e84e3ea23118de4f4c7be8d2d14e979154b6d' 
  AND token = 'bWUVvMP2PeYsFsZcl7HIjdy1MZqsVpYZj+bNB4uY+WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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