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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2b5803bd5d1e3c28841fc608d86d4654b7f5a5fc77082b94aa9355812b7f714' 
  AND token = 'v+PnTOKen/ax00l9V50UMSJln55bl1RYJt1DqeBRRTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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