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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '088c7405ab406d3dc432981d8e68b32a74819f2ca754391649caa90f5e5308af' 
  AND token = 'l2pfSM5L5k0BTxeGnRKoA4n5AXmkeGBqlnSBr8Hrhcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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