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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02e88edcd17ec8e3c7ca435a4de7b61a6f407685c2785f5ad613e2a0452bf92b' 
  AND token = '2XH0iRmtqP8pEqQvNk4iHcPJyZO5Z+MhuTSgh37pdQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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