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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a470900444a9b9131dc326c6fe7db485dda403bd7d239704084e60b9118d3b2d' 
  AND token = 'pnROJFDNk72eYURj0CnAHAXtKLBAAGiHQ1F2jys3grM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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