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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecec7666682e71aa2bcd31259abf0e5545524e59869999cfb320b3340dd2fbcb' 
  AND token = 'aH8FwvVsQBIw13T1unufHKSVcPIpJShtWk5Vk2ol9nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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