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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '674867f49cecde839aff24b71386fc0f6f3b5cf92221786fb77ab25b04fe9763' 
  AND token = 'Bcnx3hjmE6zWxwwmjjqkyAjkVz/4zhY22A22XYbMy+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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