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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67e900a343f071d6404fe2284303f0250a1799663406e7ab80f192b8b5721114' 
  AND token = 'PW3u6LHwPhfW/uZXPRtkco4Vs+d3TIezX2bSXbldYBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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