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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0205d7378c01cc48444e99d445916d646eb30164a1bcb4fc57bc697eb6147f6' 
  AND token = '/xXcEFm595nBk6t0oBj6FUrfN4q70ztpnpNkT4XtC/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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