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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77975cfdc5b01f52dc10ef34431cf94ea82da7bdc2571a6b3279f3e8451f46be' 
  AND token = 'K4T9KhpkdEhmKrw2G71r4MwezaJ89M7mZ9EwkMjP4qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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