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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ded2f557c01b98326db483aef08c1a0a1288ef1afaaa3ee3f5eb89a8edcb2129' 
  AND token = 'Wr92FfEB6tTE296ORa8qfq7PtxeM4OrN+f/wXMsOn1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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