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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e51f9eb0ed0868a103a5e97df0d3701bcf8c9dbe64859c601b28394d6beee86' 
  AND token = 'UQFGw87skFRfx5tiJuSCl99KlIFusaEurEUwdYwHjTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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