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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e79520543859f9ee385f8a0cd190f93a95495e927e968dd3ad0ca509ae577ec4' 
  AND token = 'FK4tAaLgncRvO/DM7ec7jXY4R0i9Rdq6q/rOkhnDhYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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