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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b41d2b1979e033e956343f26b3f59291b917cbb6a2da6c928af3e6e472d70ff' 
  AND token = 'l/3zOUKm5wuZSBMTOg0DkTsBL1zpupzsZTTNT8tl68k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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