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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ee4e92e4a94d64c45085fb591fbbf31de60f33d84ae6589bb061e6d51f21fe3' 
  AND token = 'GxpV3rVa3heLrkJr6eMgKzQp6ceERCU29319zu4qXUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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