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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b3a34eba8a6100b5c4f51d6728614d213a0a9c5b6b9bfa41d1d1dde87f9082' 
  AND token = '8C92BGVjtUn58NOSxyzrbVF3IJsk8POFBRKkjComKwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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