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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb5b25d504dac8cd193224889bad25e3fceef9bd7a244cb3b844194ef2b2917' 
  AND token = 'S/VHidjdBcT9GOxaWdF5QdkR12XE7V+jJ83g5JSslPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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