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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bcd0a05146f88f3d51570c12bf26440f2754bb4cae2534a85a8db90e66aa426' 
  AND token = 'Q4rH/V+5AqH6gC3IXEiY6hyuTcfl3Es6STKUteBAIfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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