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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98ce9a65f0ae9cd365157d27d8d7dd83315fd12310069a8769f76dab9ac03224' 
  AND token = '/HFF3nFMrYHBgZ2Plx+T7fUPlrYA9J1klQ1B5NZV73M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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