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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bd39fc9e9f415db363cb291dd689dd68829dbd4087d59696c5e8f9615e15e3f' 
  AND token = 'UEnCrhM4qtPg2+lSUlgG+IzX2IegLoE3JOUy4rddJuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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