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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fba125c17db70eaceec31624be61263ca8685dacdb79a46b1cabf7f6972b00e' 
  AND token = 'HgdrF8XzAE+l2vmXE3dGkC8rg9fXJ/IaUX+lJu86Nv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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