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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '586b91ca9496cfb3b4f919551ebf0d4edccb614a5cb0137dc24705a8a87f2b47' 
  AND token = '4Jro7tUV4EeJdfoFDgzpb3p6tajnK5s+//Vpu8Rzq8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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