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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd62f53977f93c19cda5f01a9a577dd1c97e8ac5ab2d6cb8daf88317679aea42' 
  AND token = 'qzePm77ru8blw35rTArjI+wCR3+a8+RUGgUBb/+UrtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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