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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34744277d7bbfe7db6526757743277e2233348bf21281f6227f6051742ce1bb1' 
  AND token = '5bS/mGXs6zgUZ5eym8hqC61JDYPWYh8YdBVBkjaIBo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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