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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7590ac6a0cf9a34cfc25b22f8ca2f326d6223b08c306b0249648d7a83ca6986d' 
  AND token = '/KPKe4GwVZ+SeChoHUMMDhiY18CQpiRct6no4UrL+SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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