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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e2b4763fc3e6f2a5ff17d9294f9239230530e6adc29b673cab0961f6bd97ccb' 
  AND token = 'hgdfKULINXwLjRGZk7qvL6G7uqTBU9JoPHeepM6LacU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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