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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62781e153107cff3da077b3445e463e5e34d65e00171769137003baaa95f3085' 
  AND token = 'wsnJN6lrGPdoZOJa4A9kRFWgYWFlIrbkMVP5davOdNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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